\ Size : 2.0mm x 16Choke chain is a length of chain with rings at either end such that the collar can be formed into a loop around the top of the dogs neck, just behind the ears.The ring that connects to the leash goes over the top of the dogs neck, not under.The choke-chain collar is an effective training tool when used correctly.Material: Iron, Chrome Plated\Dimensional Weight: 1.0 lb